Yarn package braking device



7 y 1966 c. c. BAGWELL, JR 3,252,666

YARN PACKAGE BRAKING DEVICE Filed April 50, 1964 4 '8 24 INVENTOR 28 Charles C. BogweH JR.

ATTO NEYS til t United States Patent 3,252,666 YARN PACKAGE BRAKING DEVICE Charies C. lilagwell, Jr., Fort Bragg, N.C., assiguor to institute of Textile Technology Filed Apr. 36, 1964, Ser. No. 363,945 3 Claims. ((31. 242-18) This invention is for yarn package braking device and is more particularly directed to a gravity actuated braking device which engages the yarn package core and stops the rotation of the yarn package upon the withdrawal of the yarn package from a winding surface.

A yarn package, or cheese, is a package of yarn wound upon a core. conventionally the yarn package is formed by winding the yarn upon the core which in turn is mounted for rotation upon the hub of a winding assembly. The yarn package is surface driven by bringing it in contact with a separate winding surface, usually a rotating drum.

The winding assembly is mounted upon a pivotal swing arm so that when the core has become filled, the entire winding assembly may be removed from the winding surface. The yarn package is then stopped, removed, a new core is placed upon the winding assembly and the operation is repeated.

The present invention is particularly directed to the means for stopping the rotation of the yarn package afer it has been removed from contact with the winding surface and takes advantage of the pivoting of the swing arm upon which the winding assembly is mounted. The invention makes use of the principle of gravity actuating pivotally mounted brake shoes.

While gravity actuated brake shoes are known in the art, none has heretofore solved the problem of braking large yarn packages so that the package is halted quickly yet with the application of uniform pressure. Further, prior art devices do not permit quick release of the braking forces and thus quick removal of the yarn package, as does the present device.

The present invention is based upon the discovery that a pair of gravity actuated brake shoes eccentrically mounted on pivots and brought in contact with the core of the yarn package rather than against the winding assembly hub is more effective in stopping the rotation of the yarn package. Further, it was learned that by mounting the contact portion of the brake shoe upon the main body of the brake shoe by springs a slight back pressure is exerted upon the yarn package after it has come to a stop, thereby releasing the brake and facilitating the removal of the yarn package from the winding assembly.

Accordingly, the present invention is for a gravity actuated yarn package braking device for use in a yarn package winding assembly which is movable from a winding position to a doffing position. The braking device isxfor braking a yarn package rotating upon a winding assembly after the winding assembly is removed from the winding position. The braking device comprises a mounting plate secured to the spindle of the winding assembly and a pair of brake shoes each pivotally mounted upon a pivot pin secured to the mounting plate. The placement of each pivot pin is eccentric with respect to the center of gravity of each brake shoe such that the brake shoes are caused to rotate out of contact with the yarn package core when the assembly is in the wind ing position and caused to rotate into contact with the yarn package core when the assembly is in the doffing position. Each brake shoe further has a main body portion and a contact portion and shoe springs interconnecting the main body portion with the contact portion. The shoe springs are to allow the contact portion to move slightly in the direction of the yarn package rotation and to transmit a reverse motion to the yarn package upon its coming to rest, thereby releasing the brakes.

A better understanding of the invention will be had by referring to the drawings which illustrate the preferred embodiment of the invention.

FIG. 1 is an elevation showing the winding assembly both in contact and out of contact with the winding surface.

FIG. 2 is an end View of the winding assembly showing the brakes in braking engagement with the yarn package core.

FIG. 3 is a view of the winding assembly partly in section taken on line 3--3 of FIG. 2.

Referring to FIG. 1, there is shown a winding assembly 2 with a yarn package 4 positioned thereon. The winding assembly 2 is mounted for rotation upon a swinging arm 6 which in turn is mounted for rotation upon pivot 8 on standard 10. The yarn package 4 is shown in the winding position A against a rotating drum 12 and also in the dotted position B. The winding assembly 2 and yarn package 4 are moved from the winding position to the dotted position by the action of rod 14 pivotally secured to swinging arm 6.

The yarn package 4 is wound upon a core 16 which is tubular in shape. The core 16 is held by the hub 18 of the winding assembly and is dimensioned for a sliding fit over the hub which is also tubular shaped.

A clear understanding of the relationship of the core 16 to the hub 18 and to the winding assembly generally, will be had by reference to FIGS. 2 and 3. There, the winding assembly 2 is shown to comprise a spindle 20 having a threaded end 22. Hub 18, having support ribs 24 is mounted for rotation upon spindle 20 by ballbearing assembly 26. The winding assembly 2 is secured against axial movement by mounting plate 28 secured upon threaded end 212 of the spindle 20. When core 16 is mounted upon hub 18, core 16 and hub 18 may be freely rotated as a unit about spindle 20.

The mounting plate 28 performs a more important function in acting as a support for brake shoes 30 and 32. Brake shoes 30 and 32 are pivotally mounted upon pivots 34 and 36 respectively which are in turn secured to mounting plate 28. Adjacent brake shoe 30 is stop pin 40, also secured to mounting plate 28. The stop pin is to prevent the brake shoe from getting too far out of position when the core 16 is removed. It also assists in the brake releasing act-ion described later. Referring to FIG. 1 the brake shoes are shown out of contact with the core 16 in winding position A and in braking contact with the core 16 in the dotted position B.

Referring again to FIGS. 2 and 3, the brake shoes 30 and 32 are there shown in braking contact with yarn package core 16. Brake shoes 30 and 32 each comprise a main body portion 42 and 44 respectively. A contact portion 46 is connected to main body portion 42 and contact portion 48 is connected to main body portion 44. The connection between the contact portions 46 and 48 and their respective main body portions is by adjustable shoe springs 50. The adjustable shoe springs 50 each comprise a spring portion 52 and adjusting bolt 54 to vary the pressure upon the spring portion and thus the pressure and alignment of the shoe on the core 16 when the shoe is in braking engagement. The shank of each adjusting bolt 54 has a diameter less than the internal diameter of the drilled hole 56 through which the adjusting bolt is passed. Thus, the contact portions 46 and 48 are each movable a slight distance laterally with respect to the main body portions.

From the drawings it will be noted that the position of the pivot pins 34 and 36 is eccentric with respect to the center of gravity of each brake shoe. In the winding position A the center of gravity of brake shoe 30 is inward of its pivot 34 so that the brake shoe 30 is caused to rotate to the left (as viewed in FIG. 1) and thus away from the core 16. The center of gravity of brake shoe 32 is outward of its pivot 36 so that the brake shoe 32 is caused to rotate to the left and thus away from the core 16. In doifed position B both brake shoes 30 and 32 by reason of the locations of their centers of gravity with respect to their respective pivots are caused to rotate to the right and thus into contact with the core 16. From the foregoing it can be seen that when the yarn package 4 is in the winding position A the brake shoes are caused to rotate inwardly and out of contact with the yarn package core 16. When the yarn package 4 is moved out of the winding position A by the swing of arm 6 through an arc of approximately 200, to dotted position B, the brake shoes are caused to rotate outward and into contact with the core 16.

When the brake shoes 30 and 32 are gravity rotated into contact with the core 16 the rotation of the core will exert a tangential force upon the facing surfaces of the contact portions 46 and 48. This tangential force will tend to displace the contact portions 46 and 48 a slight distance in the direction of rotation of the yarn package core 16. At the same time, because of the orientation of the pivot pins 34 and 36 there will be a general tightening of the contact between the brake shoes 30 and 32 and the core 16. The stop pin 40 will prevent the continued rotation of the main body portion 42 beyond the pin and thus accent the relative movement between the contact portion 46 and the main body portion 42. After the core 16 has stopped, the potential energy stored in the shoe springs 52, as a result of the displacement of the contact portions 46 and 48 in the direction of rotation, will be translated into kinetic energy thus drawing the contact portions back to their normal positions. The result will be a reverse rotation of the yarn package core 16. This reverse rotation will lighten the pressure contact between the brakes 30 and 32 and the core 16 thereby facilitating removal of the yarn package core 16 from the winding assembly.

I claim:

1. In a yarn package winding assembly movable from a winding position to a doffing position, a gravity actuated yarn package braking device for braking a yarn package including a core rotating upon a winding assembly after said winding assembly is removed from the winding position, said braking device comprising (a) a mounting plate secured to the spindle of the winding assembly,

(b) a pair of brake shoes each pivotally mounted upon a pivot pin secured to said mounting plate, the placement of each said pivot pin being eccentric with respect to the center of gravity of each said brake shoe such that said brake shoes are caused to rotate out of contact with said yarn package core when said assembly is in the winding position and caused to rotate into contact with said yarn package core when said assembly is in the dofiing position,

(c) each said brake shoe further having a main body portion and a contact portion, and

((1) shoe spring means interconnecting said main body portion with said contact portion to allow said contact portion to move in the direction of said yarn package rotation and to transmit a reverse motion to said yarn package after it comes to rest, thereby releasing said brakes.

2. In a yarn package winding assembly movable from a winding position to a doffing position, a gravity actuated yarn package braking device for braking a yarn package including a core rotating upon the winding assembly when said winding assembly is removed from the winding position said braking device comprising (a) a mounting plate secured to the spindle of the winding assembly,

(b) a pair of brake shoes each pivotally mounted upon a pivot pin secured to said mounting plate, the placement of each said pivot pin being eccentric with respect to the center of gravity of each said brake shoe such that said brake shoes are caused to rotate out of contact with said yarn package core when said assembly is in the winding position and caused to rotate into contact with said yarn package core when said assembly is removed from the winding position and through an arc of approximately 200 to the dotfing position,

(6) each said brake shoe further having a main body portion and a contact portion, and

(d) adjustable shoe spring means interconnecting said main body portion with said contact portion to allow said contact portion to move in the direction of said yarn package rotation and to transmit a reverse motion to said yarn package when it comes to rest, thereby releasing said brakes.

3. In a yarn package winding assembly movable from a winding position to a dolfing position, a gravity actuated yarn package braking device for braking a yarn package including a core rotating upon the winding assembly when said winding assembly is removed from the winding position said braking device comprising (a) a mounting plate secured to the spindle of the winding assembly,

(b) a pair of brake shoes each pivotally mounted upon a pivot pin secured to said mounting plate, the placement of each said pivot pin being eccentric with respect to the center of gravity of each said brake shoe such that said brake shoes are caused to rotate out of contact with said yarn package core when said assembly is in the winding position and caused to rotate into contact with said yarn package core when said assembly is removed from the winding position and through an arc of approximately 200 to the dofiing position,

(0) each said brake shoe further having a main body portion and a contact portion,

((1) shoe spring means interconnecting said main body portion with said contact portion to allow said contact portion to move slightly in the direction of said yarn package rotation and to transmit a reverse motion to said yarn package upon its coming to rest thereby releasing said brakes, and

(c) said shoe spring means including adjusting bolts interconnecting said main body portion with said contact portion whereby the compression of said brake shoes upon said yarn package core may be adjusted.

References Cited by the Examiner UNITED STATES PATENTS 2,311,175 2/1943 Hitt 24236 FOREIGN PATENTS 822,522 11/1952 Germany.

7/1962 Ingham .242129.8 

1. IN A YARN PACKAGE WINDING ASSEMBLY MOVABLE FROM A WINDING POSITION TO A DOFFING POSITION, A GRAVITY ACTUATED YARN PACKAGE BRAKING DEVICE FOR BRAKING A YARN PACKAGE INCLUDING A CORE ROTATION UPON A WINDING ASSEMBLY AFTER SAID WINDING ASSEMBLY IS REMOVED FROM THE WINDING POSITION, SAID BRAKING DEVICE COMPRISING (A) A MOUNTING PLATE SECURED TO THE SPINDLE OF THE WINDING ASSEMBLY, (B) A PAIR OF BRAKE SHOES EACH PIVOTALLY MOUNTED UPON A PIVOT PIN SECURED TO SAID MOUNTING PLATE, THE PLACEMENT OF EACH SAID PIVOT PIN BEING ECCENTRIC WITH RESPECT TO THE CENTER OF GRAVITY OF EACH SAID BRAKE SHOE SUCH THAT SAID BRAKE SHOES ARE CAUSED TO ROTATE OUT OF CONTACT WITH SAID YARN PACKAGE CORE WHEN SAID ASSEMBLY IS IN THE WINDING POSITION AND CAUSED TO ROTATE INTO CONTACT WITH SAID PACKAGE CORE WHEN SAID ASSEMBLY IS IN THE DOFFING POSTION, 